Hello,I have built this system to be my video editing rig, and I need help pushing my PC further to 4.2 GHZ and running stable. Currently I am at the specs below with my PC, however I run prime95 which crashes and at one point a core dropped down to 50% load and failed.

So please look at my specs below and suggest what I need to do further to stabilize a 4.2GHz Overclock on the 980x

Its really all proportional. You should look up some of the guides or methods people have posted on the forums about overclocking i7 920s and essentially apply the same method changing a few things. Its all about trial and error and not exceeding recommended max voltages such as not going over vcore 1.4.

You can cause damage to your CPU by going too high in the voltages, but it's rarely an instant thing, usually it will get damaged over months or years unless you do stupidly high voltages. The gigabyte BIOS notifies you what are sort of 'standard' levels of voltages. Any time you are selecting voltages, when it turns pink you know that that is getting into the trouble area. If you are staying below the pink, the voltages *should* be fine for ~3 years or a bit longer if you're lucky. Red is definitely only for experts who just want to benchmark.

Load Line Calibration .................[Standard]
CPU Vcore ...............................Current: 1.3000V - can go higher if you need to.
QPI/VTT Voltage.......................1.580V - getting really really high! You need more for 12GB vs 6GB, but I wouldn't suggest over 1.45v for anything long term
CPU PLL...................................AUTO - Some people have success with lowering this to 1.6 or 1.65v

MCH/ICH:

PCIE......................................1.500V
QPI PLL...................................1.100V - may or may not need a slight bump.
IOH Core..................................1.100V - If you have more than 1 GPU, you will have to bump this up
ICH I/O...................................1.500V
ICH Core.................................1.100V

Try using a higher bclk and a lower multiplier as this will often reduce your VTT voltage. I don't see why you're trying to kill yourself with a high overclock on your RAM. 1600Mhz at CAS-9 is extremely fast and only benchmark tools benefit from faster than that. Installing 12GB of ram takes a lot more voltage than 6GB, so I really suggest you don't go past 1600 Mhz CAS-9 as you're just making it that much harder for almost no performance gain. For IOH core, try adding .2v for each GPU after your first.

Pretty worried still about possibly shorting something out, is it only damage over time to the CPU? Or is it possible that there is unseen damage down now to my CPU that I have abused it with voltage. My worst settings I put in was a stupid clock with like the Vcore as 1.58 and the QPI/VTT 1.6 for 4.6Ghz I was going for.

I'd be worried if I had Vcore @ 1.6V even for a little while. The Intel spec sheet says that anything over 1.4V will cause damage, so, assuming they know what they're talking about, I think that voltage might have caused some damage. Also, isn't QPI voltage supposed to be less than Vcore, or is it just supposed to be +/- a certain range?

is 39C your idle temps? What really matters are your load temps. Do you have those numbers available? I have my CPU running at 4.2 (168x25) @ 1.35V but my memory is at 1333MHz.

Edit: I don't know about the RAM you have, but my ram rated at 1600MHz wouldn't run at that speed after I OC'd my CPU. I guess I could bring it back to those speeds with more voltage, but I prefer to be conservative with my voltage and I find RAM frequencies have no noticeable impact on performance (like 1333MHz seems fine for me).

I highly doubt you damaged your CPU with a short burst of 1.6v.......no way!!!
FYI
For me to run my 980X stable at 4.33 Ghz I need high vCore, as in 1.43v....I have run it at this for a few months with no ill effects.....hav bumped vCore to 1.55v for a few Bench runs @ 4.6 Ghz...again, no ill effects.
As was mentioned, try to keep both your vCore and vTT at or below Intel Recommended Max of 1.4v.
All chips are different....some require less and some require more.....my 980X requires 1.38125v vCore and 1.325v vTT for stable 4.13 with 12GB Doms @ Cas8.

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Introducing me n my OCD to Watercooling, is like taking an Alcoholic to an "all you can drink" Beach Bar in Mexico